Oakton Instruments WD-37250-60, WD-37250-20, WD-37250-50 User manual

Page 1

10. Warranty

OAKTON warrants this instrument to be free from significant deviations in material and workmanship for a period of one year from date of purchase. If repair or adjustment is necessary and has not been the result of abuse or misuse within the warrantied time period, please return—freight prepaid—and correction will be made without charge. OAKTON alone will determine if the product problem is due to deviations or customer misuse.

Out-of-warranty products will be repaired on a charge basis.

11. Return of items

Authorization must be obtained from our Customer Service Department before returning items for any reason. When applying for authorization, please include data regarding the reason the items are to be returned. For your protection, items must be carefully packed to prevent damage in shipment and insured against possible damage or loss. We will not be responsible for damage resulting from careless or insufficient packing. Arestocking charge will be made on all unauthorized returns.

NOTE: We reserve the right to make improvements in design, construction, and

appearance of products without notice.

OPERATING INSTRUCTIONS

OAKTON®Models 08369-50, -70

37250-00, -10, -20

Hygrothermograph

00703-07

Find Quality Products Online at: [email protected]

www.GlobalTestSupply.com

Printed in the U.S.A. 1/00

Page 2

NOTES

Table of Contents

Write down the name and information of your OAKTON distributor here.

1. Introduction.........................................................................................4-5

2. Components............................................................................................6

3. Getting started .......................................................................................7

3.1 Unpacking .............................................................................................................................7

3.2 Attaching the cylinder drum ..............................................................................................7

4. Hygrothermograph operation...........................................................8-21

4.1 Powering your hygrothermograph ................................................................................8-9

4.2 Cartridge pens ....................................................................................................................10

4.3 Setting the time...................................................................................................................11

4.4 Chart paper....................................................................................................................12-17

4.5 Calibration adjustment.................................................................................................18-19

4.6 Changing drum rotation length..................................................................................20-21

5. Installing optional axial fan.................................................................22

6. Precautions ...........................................................................................23

7. Specifications ...................................................................................24-25

8. Ordering information...........................................................................26

9. Appendix 1: Readings in areas with high humidity ............................27

10. Warranty.............................................................................................28

11. Return of Items...................................................................................28

Find Quality Products Online at: [email protected]

www.GlobalTestSupply.com

Page 3

1. Introduction

Thank you for selecting an OAKTON thermohygrometer. These precision instruments are useful for monitoring temperature and relative humidity conditions over time. They create a permanent chart recording of these measurements for your records. Their quartz-controlled drive maintains an even drum speed even when batteries are weak (or when the spring winding runs down).

Typical applications include general weather measurements, agriculture, horticulture, monitoring the condition of test laboratories, humidity chambers, computer rooms, precision machinery rooms, food storage facilities, warehouses, museums, bank vaults, film and book storage facilities.

You have one of five available models:

Minidrum hygrothermograph

Model number: 08369-70 Special features:

• Compact size

• Records on 7-day rotation

• Protective acrylic cover locks into place

Domed minidrum hygrothermograph

Model number: 08369-50 Special features:

• Our most compact model

• Records on 7-day rotation

• Protective glass dome

Spring-wound, two-speed hygrothermograph

Model number: 37250-10 Special features:

• Spring wound— no batteries needed!

• Records on 1- or 7-day rotation

• Protective acrylic cover locks into place

Three-speed hygrothermograph

Model number: 37250-00 Special features:

• Records on 1- or 7-, or 32-day rotation

• Protective acrylic cover locks into place

Long-cycle hygrothermograph

Model number: 37250-20 Special features:

• Records on 1 or 3 month rotation

• Protective acrylic cover locks into place

Find Quality Products Online at: [email protected]

www.GlobalTestSupply.com

Page 4

2. Components

All OAKTON hygrothermographs have these same features:

3. Getting started

3.1

Unpacking

1. Remove all components from the packing material.

2. Carefully remove the acrylic or glass protective cover from the hygrothermo-

graph. If your model has a handle, turn the carrying handle to the left until it stops, then lift up the protective cover.

3. Carefully remove the styrofoam piece located beneath the pen arm mechanism.

4. Remove the white paper that secures the humidity pen.

5. Lift the metal pen holding fitting up from the temperature pen until it is removed

from the pen guide.

6. Move the pen lift lever towards you to pull the temperature and humidity pens to

their resting position.

NOTE: Keep all original packing in case you need to transport the instrument.

1. Pen tip for temperature

2. Cylinder drum with quartz clock

3. Pen tip for humidity

4. Paper holder

5. Pen lift lever

6. Protective cover

7. Pen arms

8. Pen guide

3.2

Attaching the cylinder drum

NOTE: Long-cycle model 37250-20 already has an attached cylinder drum.

1. Unscrew the hold-down nut from the

center shaft.

2. Carefully insert the cylinder drum onto

the center shaft. Make sure the cylinder drum is completely lowered over the center shaft.

See figure

3. Replace the hold-down nut on the top of

the center shaft.

Find Quality Products Online at: [email protected]

www.GlobalTestSupply.com

Page 5

4. Hygrothermograph operation

4.1

Powering your hygrothermograph

Minidrum models (08369-50 and -70):

These models require one AAbattery. The battery compartment is located on top of the cylinder drum. To open the battery compartment, slide the cover of the battery compartment to the side. Make sure that the + end of the battery is facing up.

Spring wound, 2 speed model (37250-10):

This model is spring wound (requires no batteries). The spring winding shaft is located on top of the cylinder drum. To wind up the unit, turn the shaft counterclockwise until it is too stiff to move any further. This hygrothermograph will make a “clicking” sound while running. The drum will maintain an even rotation speed even when the spring is winding down.

Long cycle model (37250-20):

This model requires one C battery. The battery compartment is located on top of the cylinder drum. To open the battery compartment, flip open the lid on top of the cylinder drum. Note polarity inside the battery compartment.

This model features a battery indicator. To check the battery, press the red check button next to the battery compartment. The power indicator has green, white and red zones.

• the green zone means the battery is in good condition.

• The white zone means the battery is low

and will have to be replaced soon.

• The red zone means the battery is very

low and should be replaced immediately.

Close-up of battery indicator

BATTERY

3 speed model (37250-00):

This model requires two C batteries. The battery compartment is located on top of the cylinder drum. To open the battery compartment, pull the silver knob on top of the battery compartment away from the center of the cylinder drum. Note polarity on the lid of the battery compartment.

This model features a battery indicator. To check the battery, press the red check button next to the battery compartment. Note the color of the LED indicator:

• A green LED means the batteries are in good condition.

• A red LED means the batteries need to

be replaced.

Top of Drum

Close-up of battery indicator

Find Quality Products Online at: [email protected]

www.GlobalTestSupply.com

Page 6

4.2

Cartridge pens

To operate the pens:

1. Pull the pen lift lever towards you to move the

temperature and humidity pens to their resting position.

See figure

2. Remove the pen caps by rotating them counter

clockwise.

3. Push the pen lift lever away from you until the

temperature and humidity pens are touching the paper on the cylinder drum.

NOTE: Do not touch the pen tips, because skin oils will prevent the ink from flowing smoothly.

To replace the pens:

The pen tips can be used for up to a year, but we recommend that you replace them at least every six months. Conditions such as high temperature or low humidity may shorten pen life to three months.

See the “Accessories” section on page 26 to order extra pens.

1. Hold the pen arm in your right hand and pull

the pen cartridge off with your left hand. If it is difficult to pull off, use a small pliers.

See figure

2. To attach the replacement cartridge pen, insert it

over the arm until it is fully attached.

4.3

Setting the time

Models 08369-50, 08369-50, 37250-10, 37250-00:

1. Pull the pen lift lever towards you to

move the temperature and humidity pens to their resting position.

See figure

2. Turn the cylinder drum one full

rotation clockwise.

See figure

3. Turn the cylinder drum counterclock-

wise until the pen tips align with the correct time of day or night. Numbers indicating time are located at the top and bottom of the chart paper.

NOTE: Make sure that the numbers on the graph are right side up. Change the chart paper when the cylinder has completed one rotation.

Long cycle model (37250-20) only:

1. Pull the pen lift lever slightly towards

you to move the temperature and

humidity pens away from the chart.

See figure

2. Turn the chart assembly knob

(located on top of the chart assembly) clockwise.

See figure

3. Stop when the time printed on the

chart paper and pen tips line up about two hours past the present time.

4. Turn the cylinder counterclockwise to

the correct present time.

5. To take up slack in the chart paper,

turn the chart paper roll counterclockwise until the paper is taut. Be sure not to offset the alignment of present time and pen tips.

See figure

1110

Find Quality Products Online at: [email protected]

www.GlobalTestSupply.com

Page 7

4.4

Chart paper

NOTE: See pages 13-17 for directions on changing the chart paper on long-cycle model 37250-20.

Your cylinder drum comes with one sheet of chart paper already attached. See the “Accessories” section on page 26 to order extra chart paper.

To replace chart paper for models 08369-50, 08369-50, 37250-10, 37250-00:

1. Wind the new chart onto the cylinder so

that the two ends of the paper overlap.

See figure

2. Secure this overlapping section with the

See figure

3. Make sure the markings on the paper

4. Follow directions on bottom of page 11

paper holder.

coincide where the overlap occurs.

to set the correct time.

To replace chart paper for long-cycle model 37250-20:

The long-cycle hygrothermograph comes with one roll of paper installed. As the unit records, paper moves from the Chart Roll to the Take-Up Roll. When the paper is completely used, you need to replace the chart paper.

NOTE: do not discard cardboard tube from the original chart paper roll. You will need this cardboard tube for use on the Take-Up Roll.

For best results, we recommend you use our chart paper. See the “Accessories” section on page 26 to order extra chart paper rolls.

When the chart paper is nearing the end of its cycle, a red stripe will appear on the lower edge of the chart paper. The stripe means there are only three days left, and that the paper should be changed by that time.

To change the chart paper:

1. Remove the protective cover. Pull the

pen lift lever towards you so the pen tips do not touch the paper. Write the time and date on the chart paper.

2. Wind the old chart paper onto the

Take-Up Roll by turning the Timing Roll knob clockwise (in the direction

of the arrow).

See figure

3. Release the right and left chart

assembly locks located on the base of the instrument near the chart drive mechanism.

See figure

Timing roll knob

Chart assembly locks

4. Pull the chart assembly back using

the handle located behind the chart assembly. To prevent the unit from

tipping over, hold the base of the instrument with your other hand. Use the handle to keep the chart assembly in a horizontal position.

See figure

Find Quality Products Online at: [email protected]

www.GlobalTestSupply.com

1312

Page 8

5. Remove the empty cardboard tube

from the Chart Roll (see sticker on top of chart assembly for position).

See figure

• Push the Chart Roll towards the top

• Pull the Chart Roll out from the

• Remove the upper plastic disk of

• Remove the cardboard tube from the

See figure

of the chart assembly, which removes it from the groove at the base of the assembly.

bottom.

the Chart Roll by turning it counter-clockwise.

metal spindle (spindle is inside the cardboard tube). Save this cardboard tube for step 7.

6. Remove the Take-Up Roll with

the old chart paper from the chart assembly (see sticker on top of chart assembly for position).

See figure

• Push the Take-Up Roll toward the

• Pull the Take-Up Roll out from the

• Remove the upper plastic disk of

• Remove the used chart paper,

See figure

top of the chart assembly, which removes it from the groove at the base of the assembly.

bottom.

the Take-Up Roll by turning it counter-clockwise.

complete with inner cardboard tube, from the metal spindle(spindle is inside the cardboard tube).

Chart roll

cardboard tube

Take-up roll

upper disk

lower disk

slot

stopper

7. Replace the Take-Up Roll with the

empty cardboard tube into the chart assembly.

• Place the empty cardboard tube (from step 5) back over the metal spindle of the Take-Up Roll. Make sure that the slot on the Take-Up Roll fits into the ridge on the lower disk.

• Replace the upper plastic disk of the

Take-Up Roll by turning it clockwise.

See figure

• Place the pointed spindle tip

See figure

(protruding through the upper disk) into the receptacle at the left (on the upper part of the assembly). Push to the left, and reinsert the right end of the take-up cylinder into the bottom groove. You may have to turn the cylinder slightly until it slides into the groove.

8. Install the new chart paper on the

Chart Roll.

• Load the new chart paper onto the Chart Roll, making sure that the slot on the chart paper roll fits into the ridge on the lower disk.

• Make sure that the chart paper is loaded correctly. The side of the paper with the oval-shaped sprocket holes should be at the upper disk (top), while the side with the round sprocket holes should be at the lower disk (bottom).

• Replace the upper plastic disk of the

Chart Roll by turning it clockwise.

See figure

Take-up roll

cardboard tube

upper disk

lower disk

stopper

slot

1514

Find Quality Products Online at: [email protected]

www.GlobalTestSupply.com

Page 9

9. Install the Chart Roll with the new

chart paper back into the chart assembly.

• Place the pointed spindle tip (protruding through the upper disk) into the receptacle at the left (on the upper part of the assembly). Push to the left, and reinsert the right end of the starting roll into the groove (on the lower part of the assembly). Make sure that the roll is securely installed and can pivot easily.

See figure

• Make sure paper is positioned so

See figure

it will run in a counterclockwise direction around the Chart Roll.

10. Pull out the chart paper about 6

inches. Draw the paper around the Timing Roll. Make sure the sprocket holes in the paper are placed correctly over the sprockets on the

Timing Roll.

See figure

11. Tape the end of the chart paper to

the Take-Up Roll. Remove any other paper that might still be attached to the Take-Up Roll. Be sure the paper is straight and even so that it tracks properly.

See figure

12. Advance the chart with the timing

Chart roll

knob.

13. Return the chart assembly upright

to its original position.

See figure

14. Tighten the right and left assembly

locks to hold chart assembly in place.

See figure

15. To set time, see bottom of page 11.

16. Make sure to check that pen car-

tridges and batteries are still fresh.

Take-up roll

Timing roll

Notes

Be sure to check at least once a month to guarantee accuracy, since the instrument operates over a long period of time (30 or 90 days).

Also make sure to periodically check that the pens are operating correctly.

Vibrations could loosen the chart paper in about 60 days. The paper should be tightened for accurate time readings.

1716

Find Quality Products Online at: [email protected]

www.GlobalTestSupply.com

Page 10

4.5

Calibration adjustment

Your hygrothermograph is factory calibrated. However, vibration during shipment may make a slight readjustment necessary.

To adjust calibration:

1. Compare the hygrothermograph reading to another temperature/ humidity

instrument known to be accurate.

2. Raise and lower the reading by turning the adjustment screws.See drawings on

these two pages for location of the adjustment screws.

Calibration adjustment screw locations

Minidrum hygrothermograph

(model 08369-70) On the minidrum hygrothermograph

model, the calibration screws are located behind the two stickers on the back of the beige case protecting the pen mechanism.

See figure

Remove the stickers to reach the calibration adjustment screws.

See figure

Domed minidrum hygrothermograph

(model 08369-50)

All other models

(models 37250-00, -10, -20)

Temperature calibration adjustment screw

Humidity calibration adjustment screw

Temperature calibration adjustment screw

Humidity calibration adjustment screw

1918

Find Quality Products Online at: [email protected]

www.GlobalTestSupply.com

Page 11

4.6

Changing drum rotation length

NOTE: Minidrum models 08369-50 and 08369-70 operate on a 7 day rotation only. Long cycle model 37250-20 accepts either 1 month or 3 month chart rolls—it is not

necessary to adjust drum speed.

Spring wound, two speed hygrothermograph 37250-10

This model lets you select between a 1 and 7 day drum rotation. When you receive your hygrothermograph from the factory, it is set for a 7 day rotation.

IMPORTANT: make sure you have the appropriate chart paper for the rotation speed you select. See page 26 to order more chart paper.

1. Look at the bottom of the cylinder

drum. You will see notches for two gears. Only one gear will be in place.

See figure

2. The alternate gear is located on a post

at the corner of the thermohygrometer’s base. Remove it from the post.

See figure

3. Using two screwdrivers, lift the gear

currently installed on the bottom of the cylinder drum.

See figure

4. Insert the other gear onto the oppo-

site shaft on the bottom of the drum.

• The one-day gear slides on the shaft marked “24 H / Z = 22”. This gear has 22 teeth and a larger diameter than the 7-day gear.

• The seven day gear slides onto the shaft marked 168H / Z = 18. This gear has 18 teeth.

5. Place the gear not in use over the

post at the corner of the thermohygrometer’s base for storage.

6. Install the cylinder drum onto

the cylinder shaft. See page 7 for directions.

Three speed hygrothermograph 37250-00

This model lets you select between a 1, 7, and 32 day drum rotation. When you receive your hygrothermograph from the factory, it is set for a 7 day rotation.

See figure

IMPORTANT: make sure you have the appropriate chart paper for the rotation speed you select. See page 26 to order more chart paper.

1. To switch from 7 day operation to

See figure

2. To switch from 7 day operation to

See figure

1 day operation, flip the switch on top of the cylinder drum to 1D.

32 day operation, flip the switch on top of the cylinder drum to 32D.

32D

2120

Find Quality Products Online at: [email protected]

www.GlobalTestSupply.com

Page 12

5. Installing optional axial fan

NOTE: The axial fan is not for use with minidrum models 08369-50 and 08369-70.

The external draft fan (optional) attaches to the protective cover. It improves instrument response and accuracy by directly pulling surrounding air into the instrument. Use the fan in areas where ventilation is poor.

If you want to order an axial fan, see the “Accessories” section on page 26.

To attach the fan:

Install the fan on the single column of five vents located on the protective cover.

See figure

2. Position fan so that the spring clips

See figure

3. Let the fan slide down until it stops.

See figure

4. Position the instrument so the

5. Plug the power cord into an 110 to

on the fan go into the upper vent slots on the hygrothermograph cover.

Make sure both spring clips are fully engaged in the cover.

flow of air from the fan will not be blocked.

120 volt, 50/60 Hz outlet. For 220 V operation, order optional 220 V transformer (sold separately in “Accessories” section on page 26).

6. Precautions

1. Do not use your hygrothermograph:

• in direct sunlight

• in temperatures below –20°C or above 50°C

• near ovens, stoves, or other heating equipment

• near harsh chemicals such as paint thinner or ammonia

• in dusty or wet environments

• within magnetic fields

• in areas with strong vibrations, such as loudspeakers or motors

2. For best results, use only the pens and chart paper listed under the “Accessories”

section of this manual (page 26). We cannot guarantee results with other pens and other paper.

3. Do not repair the instrument yourself. Should repairs be necessary, please return

the instrument to place of purchase. See the back cover of this manual for information on instrument Warranty and Return of Items.

4. If your instrument will not be used for long periods of time, make sure to replace

the pen caps and remove the battery.

2322

Find Quality Products Online at: [email protected]

www.GlobalTestSupply.com

Page 13

7. Specifications

Model Minidrum Domed minidrum

hygrothermograph hygrothermograph

Model number 08369-70 W08369-50 Humidity range 5 to 90% RH 5 to 90% RH Humidity accuracy ±5% from 10 to 90% RH; ±5% from 10 to 90% RH;

±7% from 5 to 10% RH ±7% from 5 to 10% RH

Humidity chart range 5 to 100% RH 5 to 100% RH Humidity sensor human hair bundle human hair bundle Humidity chart graduations 5% RH 5% RH Temperature range –6 to 40°C / 22 to 104°F –6 to 40°C / 22 to 104°F Temperature accuracy ±2°C / ±3.6°F ±2°C / ±3.6°F Temperature sensor bimetallic strip bimetallic strip Temp. chart graduations 2°C / 2°F 2°C / 2°F Chart size 3.6"H x 8.1"L 3.6"H x 8.1"L

Chart rotation 7 day (172 hr) 7 day (172 hr)

Power One AA battery (included) One AA battery (included) Dimensions 6"W x 7.4"H x 3.9"D 7.5"H x 5" dia Shipping weight 4 lbs 4 lbs

Spring wound, two speed Three speed Long cycle

hygrothermograph hygrothermograph hygrothermograph

37250-10 37250-00 37250-20

5 to 90% RH 5 to 90% RH 5 to 90% RH

±3% from 10 to 90% RH; ±3% from 10 to 90% RH; ±3% from 10 to 90% RH;

±5% from 5 to 10% RH ±5% from 5 to 10% RH ±5% from 5 to 10% RH

0 to 100% RH 0 to 100% RH 0 to 100% RH

human hair bundle human hair bundle human hair bundle

1% RH 1% RH 1% RH

–10 to 50°C / 14 to 122°F –10 to 50°C (14 to 122°F) –20 to 50°C

±1°C / ±1.8°F ±1°C / ±1.8°F ±1°C

bimetallic strip bimetallic strip bimetallic strip

1°C / 2°F 1°C / 2°F 1°C

6.6"H x 11.5"L 6.6"H x 11.5"L 6.6"H x 114" L (1-month)

6.6"H x 300" L (3-month)

1 day (26 hr) or 1 day (26 hr), 7 day (172 hr) 1-month (38 day max) or

7 day (172 hr) or 32 day (810 hr) 3-month (100 day max)

Spring wound Two C batteries (included) One C battery (included)

13.3"W x 11.5"H x 5.1"D 13.3"W x 11.5"H x 5.1"D 13.3"W x 11.5"H x 5.1"D 9 lbs 9 lbs 9 lbs

24 25

Find Quality Products Online at: [email protected]

www.GlobalTestSupply.com

Page 14

8. Ordering information

9. Appendix 1: Readings in areas with high humidity

Additional Hygrothermographs

WD-08369-70 Minidrum hygrothermograph WD-08369-70 Domed minidrum hygrothermograph WD-37250-10 Spring wound, two speed hygrothermograph WD-37250-00 Three speed hygrothermograph WD-37250-20 Long cycle hygrothermograph

Extra Chart Paper

Model Use with Temperature Rotation Increments Quantity/ number model type range pack

WD-08369-60 Mini-drum 22 to 104°F 7-day 2-hour 100 WD-08369-55 Mini-drum –6 to 40°C 7-day 2-hour 100 WD-08368-10 2- or 3-speed 14 to 122°F 1-day 15-minute 100 WD-08368-20 2- or 3-speed 14 to 122°F 7-day 2-hour 100 WD-08368-30 2- or 3-speed –10 to 50°C 1-day 15-minute 100 WD-08368-40 2- or 3-speed –10 to 50°C 7-day 2-hour 100 WD-08368-22 3-speed 14 to 122°F 32-day 6-hour 25 WD-08368-42 3-speed –10 to 50°C 32-day 6-hour 25 WD-37250-60 Long cycle –20 to 50°C 1-month 2-hour 1 roll WD-37250-62 Long cycle –20 to 50°C 3-month 2-hour 1 roll

Extra Pens

For use with all OAKTON hygrothermographs.

WD-08368-75 Blue pens, 6/pack WD-08368-70 Red pens, 6/pack

The specially processed human hair bundle, such as the one used in this instrument, is the best sensor for ambient humidity measurements in terms of linearity, repeatability, and temperature compensation. Human hair will elongate linearly as humidity increases or decreases in the range of 5 to 90% RH.

However, one of the characteristics of human hair is that exposure to humidity levels above 90%RH causes it to undergo a change of state. This condition is called the “saturated state”, and occurs with even short exposure to high humidity levels. When the hair bundle reaches the saturated state, it contracts and causes a 7 to 9% downward shift in the humidity indications. If the humidity then stays below 80%, the hair bundle will elongate linearly for approximately two weeks. After this time period, the hair bundle is in its dry state.

The hair bundle has two curves, depending on the state of the hair bundle. These characteristics can be taken into account when using the instrument. The instrument is calibrated at the factory with the hair bundle in the dry state. Generally, the instrument is used indoors with humidity levels below 90%.

When used in air conditioned areas or other areas of moderate humidity, you do not need to adjust the instrument.

How to use the instrument in high humidity areas:

For use above 85% RH, turn the humidity fine adjustment screw counterclockwise to raise the humidity reading by 7 to 9%. Readings will be within specifications over the entire range when the instrument is exposed to high humidity conditions (85 to 100%) at least once every two weeks.

Note any calibration change either on the chart paper or on the instrument itself. This way you can change the instrument back to its original calibration if required.

Axial Fan

WD-37250-50 Optional axial fan. Use with 2-speed, 3-speed and long cycle models

for more uniform sample measurements in fluctuating environments. 110 VAC WD-01578-02 Transformer. Use to operate axial fan at 220 VAC, 100 W

Find Quality Products Online at: [email protected]

www.GlobalTestSupply.com